On Tue, 18 Apr 2006, Don Taylor wrote:

>  How can I tell if a .pyc file was built with 2.3 or 2.4?

There's a "Magic Number" in the first 2 or 4 bytes, (depending on whether 
you consider the \r\n part of the MN).

> >> f = open("pycfile.pyc", "rb")
> >> magictable = {'\x3b\xf2\r\n': "2.3", '\x6d\xf2\r\n' : "2.4"}
> >> magic = f.read(4)
> >> release = magictable.get(magic,"unknown")
> >> print "Python release:", release
Python release: 2.4

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